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Many oil and gas industries follow a developed guideline, which is based on experience, when setting up the rating limits for selecting an induction or a synchronous motor. This question is a common one, and the answer is not quite as simple as it may seem. Many factors must be taken into consideration, where the output rating is definitely one of those factors, but not the only one. This paper will...
To enable safe, economical and environmentally acceptable solutions for improving oil and gas recovery from mature fields and for exploitation of deep and ultra-deep offshore reservoirs, new downhole technologies are required. Electrification of downhole applications has proven to be promising. This paper presents electrical machine in currently available or emerging downhole applications and their...
In practice we often meet with electrical drives, where it is necessary to operate with higher speed, while load torque is less than rated torque. This type of operation is called ldquoconstant power operationrdquo and may be defined as second range of natural motor torque-speed characteristic. In case of motors excited with permanent magnets magnetic flux is constant, and while supply voltage remains...
Due to the increasing prices of gasoline in the world market, more and more customers and car manufacturers are looking forward to the alternate energy sources to power up their vehicles. A lot of research has been taking place and vehicles fitted with solar cells, fuel cells, battery powered vehicles as well as hybrid vehicles are becoming available in the market. Cost as well as weight of the vehicle...
This paper describes the better shape design of the permanent magnet to improve the efficiency in the outer rotor type of IPMSM. Using the finite element method, characteristics of the modified motors are analyzed and compared with those of the basic motor. As a result, we have found the better shape design of the permanent magnet.
The present and future market for motors places high value on power density, operating efficiency, reliability, variable speed operation and low cost. Permanent magnet (PM) motors are now able to meet these market expectations. Compared to the prolific induction motor, PM motors provide the attributes of efficiency and reliability, plus have the additional advantages of higher power density (power...
The paper explores the impact of winding distribution and rotor design on the performance of brushless AC permanent magnet traction motors used in hybrid vehicles, during constant torque and field weakened modes of operation. The discussion is illustrated through finite element field and loss analyses based around a prototype eight-pole 33 kW continuous rated traction motor for a dual-mode hybrid...
This paper presents a development of switched reluctance motor (SRM) with 0.1mm airgap length by which high efficiency as well as high torque density can be expected as a 400W machine for servo drive application. A SRM with 0.1mm airgap length is designed by genetic algorithm-based optimum design approach so as to be compatible with an existing 400W permanent magnet synchronous servo motor from viewpoints...
High power and high efficiency in high-speed operation (e.g. 50,000 r/min) is required for motors used for vacuum cleaners. The permanent magnet synchronous motor (PMSM) is a high efficiency motor in the usual operation region. Large iron losses are generated in conventional PMSMs during high speed operation; therefore, the motor efficiency decreases considerably. In this research, we examine the...
The present and future market for motors places high value on operating efficiency, reliability, variable speed operation, low running temperature, quiet operation, and low cost. Permanent magnet (PM) motors are now able to meet these market expectations across an increasing range of ratings. Compared to the prolific induction motor, PM motors provide the attributes of efficiency, reliability, etc,...
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